Refractive Convergent Plasma Lenses Explain Extreme Scattering Events and Pulsar Scintillation

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Refractive Convergent Plasma Lenses Explain Extreme Scattering Events and Pulsar Scintillation

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Title: Refractive Convergent Plasma Lenses Explain Extreme Scattering Events and Pulsar Scintillation
Author(s):
Pen, Ue-Li;
King, Lindsay J. (UT Dallas)
Format: Text
Item Type: Article
Keywords: Pulsars
Magnetic reconnection
Abstract: We propose convergent plasma lenses, possibly from current sheets, as a generic solution to strong interstellar scattering. These lenses resolve the overpressure problem by geometric alignment as noted by Goldreich & Shridhar. Our new model further quantitatively explains properties of extreme scattering events and pulsar parabolic arcs. It makes quantitative predictions testable by VLBI on scattering events. It differs conceptually from previous models by occurring through rare, localized underdense sheets. Such sheets are thermally and kinematically stable, and could be consequences of reconnection. The apparent diffractive effects are a result of coherent interference of refractive images. We propose that these lenses can be used for precision distance determination to pulsars, enabling accurate gravity source localization.
ISSN: 0035-8711
Persistent Link: http://hdl.handle.net/10735.1/3128
http://dx.doi.org/10.1111/j.1745-3933.2012.01223.x
Terms of Use: ©2012 The Authors and the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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